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1 | #ifndef _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ |
2 | #define _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ | |
3 | ||
4 | /* | |
5 | * Compile time versions of __arch_hweightN() | |
6 | */ | |
7 | #define __const_hweight8(w) \ | |
c32fa99f PW |
8 | ((unsigned int) \ |
9 | ((!!((w) & (1ULL << 0))) + \ | |
10 | (!!((w) & (1ULL << 1))) + \ | |
11 | (!!((w) & (1ULL << 2))) + \ | |
12 | (!!((w) & (1ULL << 3))) + \ | |
13 | (!!((w) & (1ULL << 4))) + \ | |
14 | (!!((w) & (1ULL << 5))) + \ | |
15 | (!!((w) & (1ULL << 6))) + \ | |
16 | (!!((w) & (1ULL << 7))))) | |
1527bc8b PZ |
17 | |
18 | #define __const_hweight16(w) (__const_hweight8(w) + __const_hweight8((w) >> 8 )) | |
19 | #define __const_hweight32(w) (__const_hweight16(w) + __const_hweight16((w) >> 16)) | |
20 | #define __const_hweight64(w) (__const_hweight32(w) + __const_hweight32((w) >> 32)) | |
21 | ||
22 | /* | |
23 | * Generic interface. | |
24 | */ | |
25 | #define hweight8(w) (__builtin_constant_p(w) ? __const_hweight8(w) : __arch_hweight8(w)) | |
26 | #define hweight16(w) (__builtin_constant_p(w) ? __const_hweight16(w) : __arch_hweight16(w)) | |
27 | #define hweight32(w) (__builtin_constant_p(w) ? __const_hweight32(w) : __arch_hweight32(w)) | |
28 | #define hweight64(w) (__builtin_constant_p(w) ? __const_hweight64(w) : __arch_hweight64(w)) | |
29 | ||
30 | /* | |
31 | * Interface for known constant arguments | |
32 | */ | |
33 | #define HWEIGHT8(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight8(w)) | |
34 | #define HWEIGHT16(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight16(w)) | |
35 | #define HWEIGHT32(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight32(w)) | |
36 | #define HWEIGHT64(w) (BUILD_BUG_ON_ZERO(!__builtin_constant_p(w)) + __const_hweight64(w)) | |
37 | ||
38 | /* | |
39 | * Type invariant interface to the compile time constant hweight functions. | |
40 | */ | |
41 | #define HWEIGHT(w) HWEIGHT64((u64)w) | |
42 | ||
43 | #endif /* _ASM_GENERIC_BITOPS_CONST_HWEIGHT_H_ */ |